I think, as a president, you have to want respect. You can't look for love from the American people. You have to just do what you think is right. Some people will hate you, but others, in the long run, will respect you for what you've done.

What I think I've learned is that you're never going to get it all right, and you can't obsess about having a fact wrong or a date wrong or something like that, as long as you tried as best you could. If you've done the kind of research that you're sure is pretty good, then you just have to have confidence in it, so that nothing is perfect in life. I think that is what the criticism has helped me to understand.

The one thing that John Kennedy did, above all else, was to energize young people to feel that they wanted to give something to their country. I just hope, for young people of this generation, that they'll experience that feeling once again, that by working on large goals, they can do something more than their own individual ambition.

An adult friend of Lincoln's: "Life was to him a school.

As much research as you think you're doing, you're going to mess up, without a question.

When I do research, I have done - 90 percent of my time is the research, the other ten percent is the writing. So I don't have to face a blank piece of paper. I can look at this as a quote that I have from somewhere.

I've chosen to be a commentator and an analyzer of politics, rather than an actual doer of it. I think it could have gone the other way, but I'm not sorry that it didn't, because this made it easier to be home with my kids and to spend time with them. Writing you can do right in your house. You don't have to go anywhere.